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le 



tile Sf: 



I, 



ii 



ISf 



aiiH 



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111 



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HUTTONIAN THEORY. 



323 



fpath en mafle contient des cryfteaux qiiartzeux, 

 qui n'ont le plus fouvent que le carcaiTe, et dont 



I'interieur 

 manque a 

 faces, et fo 



ft 



d 



feltfpath ; fou 



il 



rcalfes quelq 



la fe6tion de 



fens tranfverfal aux cryft 



mes de leurs 

 e pierre dans 

 prefente 



una 



fuite de figures qui font des portions d'hexagones 

 et qui ne r( 



Hebraiques 



fembl 



P 



mal 



des 



arad 



Theft 



filled 

 ftalli^ 



perfed hexagonal cafes of quartz 



th feltfp 



f fubft 



ly indicate the cry- 

 which all affumed 



their folidity at the fame time, and, in doing fo 

 conflrained the figures 



V 



of 



one 



ufe the words of Dr Hutton 



another, 

 whether 



ftallizing quartz 



fe H body of feltfp 



To 



ngfeltfpar determine the fhape of fluid 



quartz, particularly if we h 



as is here the 



cafe, two folid bodies including and included 



amounts to a demonft 



fe bodies 

 )n, and 



have concreted from a fluid Hate of fufion, ; 



have not cryftallized, in the manner of falts, fi 

 afolutionf." 



290. The quartz in granite fo generally 

 ceives the imprefiTions of all the other fubftan< 



oni 



X 



particularly 



* Journal Britannique, i&id. 



t Tranf . Royal Society Edin, uhifv^ra, p. 84, 



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